When Alex Schwazer of Italy won the 50k racewalk in Beijing four years ago, he shaved more than a minute off an Olympic-record time that had stood for 20 years. Schwazer was among the favorites to win the event again this year—the 50k race is scheduled for Saturday—but it appears he won't get that chance: Schwazer was… »8/07/12 7:00pm 8/07/12 7:00pm